Shadowgraph Observation of Supercritical Water Oxidation Progress of a Carbon Particle

详细信息    查看全文

• 作者：Masakazu Sugiyama ; Hisao Ohmura ; Masahiko Kataoka ; Takeshi Kobayashi ; and Seiichiro Koda
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：June 12, 2002
• 年：2002
• 卷：41
• 期：12
• 页码：3044 - 3048
• 全文大小：74K
• 年卷期：v.41,no.12(June 12, 2002)
• ISSN：1520-5045

文摘

Supercritical water oxidation (SCWO) progress for a spherical activated carbon particle waspursued using a flow-type reaction cell equipped with sapphire windows, where the change inthe size and shape of the particle inside the cell was observed in real time by means of ashadowgraph. While maintaining its shape, the particle radius decreased almost linearly withtime at a rate on the order of micrometers per second. Phenomenologically, the reaction occurredat the surface of the sphere. The decreasing rate of the radius was nearly first order with respectto the O₂ concentration and was almost independent of the temperature and pressure in thecell. On the other hand, the rate increased with the flow rate of the supercritical water. Thesetrends suggested that the reaction was almost limited by the mass transfer of O₂ from the bulkto the surface of the particle. The observed rate roughly agreed with the rate of O₂ mass transferwhich was estimated using empirical relations.